When you receive unwanted messages from any user, you can block the message sender. The person can't see that you have blocked them and you will simply appear offline to them. Following are some ways to block the users in wlm:
  • If you get a message from the person you want to block, click Block on the toolbar.
  • If you are in the conversation, click Block and then click the name of the person you want to block.
  • If the user is in your contacts list. Then in the main Messenger window, right-click the name of the person you want to block, and then select Block.
  • In the main Messenger window, go to Tools menu =>click Options =>then the Privacy tab. From there you can add a person to 'My Block List'.